response.sendRedirect("apage.jsp");//servlet重定向到apage.jsp
request.getRequestDispatcher("apage.jsp").forward(request, response);//servlet转发到apage.jsp
PageContext类中定义了一个forward方法和两个include方法来分别简化和替代RequestDispatcher.forward方法和include方法。
request.getRequestDispatcher("/xxxx/xxx").forward(request, response);//jsp下
request.getRequestDispatcher("/xxxx/xxx").include(request, response);//jsp下
pageContext.forward("/xxxx/xxx");//jsp下
pageContext.include("/xxxx/xxx");//jsp下